
5 things to know about coronavirus booster shots
CNN
Booster shots are here. Here's what you need to know about them.
More than 2 million people have already received third doses of Pfizer's coronavirus vaccine, but these technically were not booster shots -- they were extra doses given to people whose immune systems are compromised and may not have responded fully to the first two doses of vaccines.
But now the CDC and FDA have agreed many Americans need boosters and should start getting them. Here are some important things to know about them:

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